Throttle-valve.



Z. PAUL.

THROTTLE VALVE.

APPLICATION FILED MAE. l, 1909.

942,345. Patented Dec. 7, 1909.

ZAGOHEUS PAUL, OF CROTON, ONTARIO, CANADA.

THROTTLE-VALVE.

Specification of Letters Patent.

Patented Dec. '7, 1909.

Application filed March 1, 1909. Serial No. 480,611.

To all whom it may concern:

Be it known that I, ZACOHEUS PAUL, of Croton P. O., in the county of Kent, Province of Ontario, Canada, have invented certain new and useful Improvements in Throttle-Valves, of which the following is a specification.

My invention relates to improvements in throttle valves, and the objects of my invention are to prevent leakage when the valve is closed, to prevent freezing of the valve and to generally render more effectual the operation thereof, and it consists essentially of the structure hereinafter described in de tail in the accompanying specifications and drawings.

In the drawings, Figure 1 is a side view of the throttle valve. Fig. 2 is a longitudinal section thereof. Fig. 3 is a section on the line 2-2, Fig. 1. Fig. 4 is an enlarged sectional detail through one of the outlet valves.

In the drawings, like characters of reference indicate corresponding parts in each figure.

In its construction, the valve includes a cylinder A, having an inlet port 10 at one side thereof, and an outlet port 11 at the opposite side, and substantially in a line therewith. Within the cylinder are two spaced and reciprocable pistons B and G of any usual character and preferably provided with spring piston rings as illustrated. In the embodiment illustrated, these pistons are supported from a piston rod D, extending through packing boxes 12 and 13 at opposite ends, the said piston rod being actuated by any suitable mechanism, that illustrated including a lever 14 fulcrumed to the piston rod and having the short extremity pivoted at 15 to a link 16, the opposite end of which is pivoted to a fixed projection 17 on the side of the cylinder. It will thus be seen that when the pistons are in the position indicated in Fig. 2, both the inlet and outlet ports will be closed by the piston G. On actuating the piston rod outwardly, the space between the pistons may be brought opposite the ports, and then the steam or other fluid may flow freely through the throttle, the ports 10 and 11 being connected as usual, to the engine and boiler, through the medium of conducting pipes 18 and 19. It will be observed that the piston closing both the ports, makes an exceedingly reliable form of closure, and one in which it will be absolutely impossible for the steam to leak through.

In order to prevent freezing of the throttle, provision is made for opening the cylinder and the space between the pistons, to the atmosphere, when the throttle is closed. These means include outlet ports 20, 21 and 22, which are controlled by rotary valves, 23, 24, and 25, which are automatically actuated to open said ports, when the pistons are in closed position. The particular means shown to actuate these valves consists of cranks 26, 27 and 28 fixed to the rotary plugs of the valves, and having their extremities pivoted to a connecting rod 29, the opposite end of which is pivoted at 30 to the lever 14. In this way, when the throttle is closed, the steam inclosed between the pistons and in the ends of the cylinders may freely escape through the outlet ports 20, 21 and 22, and thus there is no liability of the throttle freezing.

As many changes could be made in the above construction and many apparentlywidely different embodiments of my invention, within the scope of the claims, could be made without departing from the spirit or scope thereof, it is intended that all matter contained in these specifications and drawings shall be interpreted as illustrative and not in a limiting sense.

What I claim as my invention is:

1. A throttle valve including a cylinder having ports on opposite sides thereof, a piston adapted, when in a certain position to close the ports, means for actuating the piston and simultaneously opening both sides of the cylinder to the atmosphere when the piston is moved to closed position.

2. A throttle valve including a cylinder having inlet and outlet ports thereon, spaced reciprocable pistons adapted when on opposite sides of the ports to afford communication between them, valves adapted when the pistons are in closed position to open the space between the piston and the opposite end of the cylinder to the atmosphere, means for actuating the piston and the valves, to open the valves when the pistons are in closed position.

3. A throttle valve including a cylinder having inlet and outlet ports thereon, a piston rod, spaced pistons thereon adapted when in one position to afford communication between the ports, valves adapted to open the ends of the cylinder and the space between the pistons to the atmosphere when the pistons are inclosed position, means for actuating the piston rod, and mechanism connecting the piston rod with the valves whereby when the pistons are moved to closed position the valves will be automatically opened. 10

In witness whereof I have hereunto set my hand in the presence of two Witnesses. 

